Preheat oven to 350F degrees.,Butter an 8x8x2 inch glass baking dish.,Heat butter in a large skillet over medium heat.,Add the green onions, and cook until soft about 2-3 minutes.,______,Blend eggs with the cream, milk, all but 2 tbsps of the Parmesan, salt, pepper and cayenne together in a large bowl.,Add the bread cubes tossing gently to coat.,Let stand 15 minutes and then stir in the mushroom-onion mixture.,Pour into the greased dish and sprinkle remaining cheese over top.,Bake until golden brown and center is set, about 1 hour.,Let it cool for 5 minutes before serving.